#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
void pan(int* x, int* y)
{
	int time=0;
	 time=*x;
	*x = *y;
	*y = time;
}


int main()
{
	int a = 10, b = 20;

	pan(&a, &b);
	printf("a=%d b=%d", a, b);
	return 0;
}